100% online games in the past were perfectly playable even after developers / publishers ended support. Online only games dying is a relatively recent invention. This petition is asking for consumer protection to return to the norm where a purchaser of an online game always has the choice of being able to play it in some fashion.
A game developer could do this by releasing a server application. They could even do this at the barest minimum by releasing documentation describing how the server ought to work, to allow for reverse engineering.
The Stop Killing Games campaign as a whole isn’t asking for perpetual server access, just to ensure that games stay in some sort of playable state.
If you are going to make me put a coin into a cart because you don’t trust me to be an adult and tidy up after myself without being nannied, then I am going to do my damndest to bypass your lock and leave a mess out of spite.
In the shops where I am trusted and not required to pay a coin (I never even carry cash these days) I tidy up because that is the decent thing to do.